TouchStream - Drip campaigns for Gmail

SendLater - Email scheduler for Mac Mail.

Signature.email - A powerful visual drag and drop email signature generator paired with the easiest way to maintain consistency for your whole team.

Assistant.to - GoToMeeting. Put your GoToMeeting link in the Assistant. to "Location" field. Once the recipient selects a time, you will both receive an invite with a unique GoToMeeting link.

Elite Email - Drag & drop email builder for awesome newsletters

Shortwave - Email smarter & faster with a reinvented experience for your Gmail